JP3211115B2 - Aerosol-type fast-drying developer used for penetration test - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aerosol-type quick-drying developer used in a penetrant testing method, and is used in a case where the temperature of an operating atmosphere is low or a jet distance is short. Even if there is, the present invention provides an aerosol-type quick-drying developer capable of always forming a thin developer layer having a uniform thickness without unevenness.

[0002]

2. Description of the Related Art As is well known, a penetrant inspection method which is a kind of non-destructive inspection method is standardized in "JIS Z2343-1992", and minute cracks and minute pins existing on the surface of various devices and members are known. Surface opening defects such as holes (hereinafter referred to as
Flaw detection). As can be seen from the above-mentioned standards, there are various penetrant flaw detection test methods carried out by combining various penetrants, detergents and developers. Among them, there are "quick-drying type" indicated by symbol "S". There is a test method called "development method". The fast-drying development method uses a fast-drying developer in which a white inorganic fine powder is dispersed in a volatile low-boiling organic solvent. After infiltrating these penetrants, the excess penetrant remaining on the surface of the test specimen is removed, and then a thin layer of white inorganic fine powder is formed by applying a quick-drying developer to the surface of the test specimen. This is a test method for detecting the presence and position of a defect by causing a defect indicating bleeding pattern to appear on the layer surface due to a penetrating liquid that has penetrated into the defect.

[0003] In the industry, "(Nippon) Non-Destructive Inspection Association, Non-Destructive Inspection Technology Series, Penetrant Testing I.
P36, P54-55, published by the Japan Non-Destructive Inspection Association, issued the 7th printing on October 1, 1992, 1989 edition, "... fast-drying developer for aerosol products is commonly used ..." (P36 )
As described, an aerosol-type quick-drying developer is widely used.

[0004] A typical embodiment of the currently available aerosol type quick-drying developer is a quick-drying type developer in which 5 to 15 parts by weight of a white inorganic fine powder is dispersed in 100 parts by weight of a volatile low-boiling organic solvent. 35-60% by weight and liquefied gas for injection 40-65% by weight
Are filled in an aerosol can with an injection nozzle.

[0005] Then, in the above-mentioned document, "... quick-dry developing method a
Shake the aerosol can thoroughly. (b) The nozzle of the aerosol can is sufficiently pushed and ejected. c Pass 1-2 times over the specimen while spraying from a distance of about 30 cm. d. Dry the developer on the surface of the test sample immediately after application and apply it so thinly that the surface of the test sample can be seen faintly ... ”(P54-55). Therefore, sufficient attention is required. This is because, when a defect indicating bleeding pattern appears on the surface of the thin layer of the white inorganic fine powder, an accurate flaw detection result can be obtained unless the thin layer has a uniform thickness without unevenness. Because it is difficult. In the art, it is said that a white inorganic fine powder thin layer having a uniform thickness without unevenness can be formed by strictly observing the above-mentioned notes a to d when applying an aerosol type dry developer.

[0006]

The following problems are inherent in the conventional aerosol-type dry developer. That is, the first problem is that when the temperature of the atmosphere in which the aerosol-type dry developer is used is low (for example, when it is used outdoors in winter).
Since the liquefied gas for injection is not sufficiently vaporized at the time of spraying, the fast-drying developer (stock solution) comprising a volatile low-boiling organic solvent in which white inorganic fine powder is dispersed does not form a uniform mist. In addition, it is inevitable that unevenness occurs in the white inorganic fine powder thin layer formed on the surface of the test sample. In the industry, when the temperature of the use atmosphere is 15 ° C. or less, unevenness is considered to occur.As a countermeasure, the spray can is immersed in warm water and heated before use, Alternatively, for example, at present, the spray can is applied while keeping the temperature of the spray can maintained by using a "heat-insulating tool for the penetrant flaw detection spraying agent developer" disclosed in Japanese Utility Model Publication No. 3-55889.

The second problem is that even if the temperature of the atmosphere in which the aerosol-type quick-drying developer is used is an appropriate temperature (usually 15 ° C. or higher), it is also necessary to heat or maintain the temperature as described above. If the distance from the orifice to the surface of the test specimen is within about 20 cm, a fast-drying developer (stock solution) consisting of a volatile low-boiling organic solvent in which white inorganic fine powder is dispersed Since the mist reaches the surface of the test sample before it spreads in a uniform mist, unevenness or thick coating cannot be avoided. Note that the above phenomenon is caused by the injection nozzle of an aerosol can using a liquefied gas for injection (for example, LPG or DME) as a propellant.
An injection nozzle of a type having a linear injection passage is employed (see FIG. 3), and the undiluted solution and the liquefied gas for injection in the aerosol can are connected to the linear injection passage of the injection nozzle (indicated by an arrow B in the drawing). ) Through the injection hole 2 of the disc-shaped chip body 1 and ejects it in a rod shape, and a certain distance from the ejection hole (normally about 20 cm)
Is reached, the liquefied gas for injection is vaporized, and the vaporized liquid is spread in the form of a uniform mist with the vaporization.

As far as the inventor knows,
Since the commercially available aerosol-type quick-drying type developer employs all types of injection nozzles having a linear injection passage, those skilled in the art recognize that the above phenomenon is inevitable, , D ”is mandatory. The reason why the above-described type of injection nozzle is employed in a commercially available aerosol-type quick-drying developer is that among those skilled in the art, if another type of injection nozzle is employed, clogging is caused by white inorganic fine powder. It can be said that it was considered. An object of the present invention is to solve the above-mentioned problems inherent in the conventional aerosol-type dry developer.

[0009]

The above technical objects can be achieved by the present invention as described below. That is, according to the present invention, the white inorganic fine powder 5 per 100 parts by weight of the volatile low-boiling organic solvent is used.
An aerosol-type quick-dry developing method used in a penetrant testing method in which 35 to 60% by weight of a fast-drying developer in which about 15 parts by weight are dispersed and 40 to 65% by weight of a liquefied gas for injection are filled in an aerosol can with an injection nozzle. In the agent, the particle diameter of the white inorganic fine powder is 0.1 to 2 μm, and the injection nozzle is located at the center of the disk-shaped chip body 1 having a constant thickness as shown in FIGS. An injection hole 2 penetrating from the front surface to the back surface is formed, and a circular cavity 3 centering on the injection hole 2 is formed on the back surface of the main body 1 and a peripheral edge 11 of the main body 1 and a peripheral wall 31 of the cavity 3 are formed. One or a plurality of straight grooves 4 connecting the
An aerosol type velocity used in a penetrant flaw detection test method, characterized in that it is a break-up type injection nozzle formed in the circumferential tangential direction of It is a dry developer.

Next, the configuration of the present invention will be described in more detail. The fast-drying developer, the liquefied gas for injection, the proportion of both used, the means for filling the aerosol can and the aerosol can in the present invention are all the same as those of the conventional aerosol-type fast-drying developer. That is, the quick-drying developer is a volatile low-boiling organic solvent selected from ethyl alcohol, isopropyl alcohol, trichloroethane, trifluorotrichloroethane, 1.1.2.2 tetrachloro1.2 difluoroethane, dichloropentafluoropropane, and the like. Parts may be prepared by dispersing 5 to 15 parts by weight of a white inorganic fine powder selected from magnesium carbonate fine powder, hydrous silicic acid fine powder, anhydrous silicic acid fine powder, etc., and the liquefied gas for injection may be a known LPG or DME or the like may be used, and the use ratio of both is 35 to 60% by weight and the latter is 40 to 65% by weight, and the aerosol can is filled at a filling pressure of 3 to 6 kg / cm ² according to a conventional method.

The important technical means in the present invention are the particle size of the white inorganic fine powder and the type of the injection nozzle. In the present invention, it is necessary to select and use the various white inorganic fine powders having a particle size of about 0.1 to 2 μm. When the particle size is smaller than this size range, the contrast between the white inorganic fine powder thin layer surface and the defect indicating bleeding pattern appearing on the surface may be deteriorated, and when the particle size is larger than this size range. May cause clogging during injection.

The injection nozzle according to the present invention is employed in an aerosol can using a compressed gas (eg, carbon dioxide gas or nitrogen gas) as a propellant, and has an injection passage for forming a swirling flow. It belongs to a nozzle (generally called "break-up type"), and the undiluted solution is formed by the pressure of the compressed gas in the aerosol can.
Spouted in a swirling shape from the injection hole, it immediately becomes a mist and spreads.

The disk-shaped chip main body 1 may be manufactured by using a metal material or a plastic material or a combination thereof, and the diameter is preferably about 4 to 5 mm, and the thickness is not particularly limited. In this case, it is sufficient that the circular cavity 3 and the straight groove 4 shown in FIG.
The diameter of the injection hole 2 is preferably about 0.3 to 0.4 mm. The diameter and depth of the circular cavity 3 are not particularly limited, and may be set according to the diameter and thickness of the disk-shaped chip body 1. Since the straight groove 4 is for forming a swirling flow, it must be formed in a circumferential tangential direction of the concave cavity 3 as shown in FIG. One straight groove 4 may be used,
Usually, it is preferable to provide three to four wires. When a plurality of linear grooves 4 are provided, each of the grooves must be arranged in a certain rotational direction (either clockwise or counterclockwise) (see FIG. 1B).

The incorporation of the disk-shaped chip body 1 into the push button of the aerosol can can be carried out in a conventional manner, as shown in FIG. 2, as shown in FIG. The disk-shaped chip main body 1 is inserted into the bottom surface of the disk-shaped concave body 61 and the back surface of the disk-shaped chip main body 1 in close contact with each other. A solid portion of the push button 6 for connecting with the jet passage pipe 63 is formed, and the jet passage 5 is connected to form a break-up type injection nozzle.

[0015]

In the present invention, white inorganic fine powder having a particle size of 0.1 to 2 μm is used, and the break-up type injection nozzle having the above configuration is used. Therefore, at the time of injection, the pressure of the liquefied gas for injection in the aerosol can depends on the pressure. , Particle size 0.1-2μ
m, a quick-drying developer (raw solution) composed of a volatile low-boiling organic solvent in which a white inorganic fine powder is dispersed, and the liquefied gas for jetting are rapidly and circularly condensed from the jet passage 5 through the linear groove 4. After flowing into the cave 3 and forming a swirling flow, it is spouted from the injection hole 2 in a spiral shape and immediately spreads as a mist. in this case,
Since the jetted liquefied gas is in the form of a mist, its vaporization is rapid, and when it reaches 5 to 10 cm from the discharge hole, it vaporizes, so that the undiluted solution becomes a fine mist with the vaporization and spreads. . In addition, since the jetted liquefied gas is in a mist state, the temperature of the use atmosphere is low (for example, 5 to 5).
(1 ° C.).

[0016]

Next, typical examples of the present invention will be described. Example 1 IPA 99% denatured alcohol (trade name: Imazu Pharmaceutical Co., Ltd.) 92.4% by weight, 6.3% by weight of magnesium carbonate powder having a particle diameter in the range of 0.1 to 0.2 μm and particle diameter of 0.1 to 0.2 μm
A quick-drying developer was prepared by dispersing 1.3 wt. Of Erosil # 200 (trade name: manufactured by Nippon Aersil Co., Ltd.) within a range of 0.2 μm, and 204 ml of the quick-drying developer (169.3%) was placed in a commercially available 450-type aerosol can. g) and 249 ml of LPG gas (13
6.5 g), and a push button incorporating a break-up type injection nozzle having a structure shown in FIGS. 1 to 4 and a diameter of the injection hole 2 of 0.4 mm was attached to the aerosol can.

Example 2 A mixture of 78.7% by weight of isopropyl alcohol, 12.5% by weight of acetone and 2.3% by weight of methyl acetate was mixed with 4.8% by weight of magnesium carbonate powder as in Example 1 and Ezil # 200 as in Example 1 (supra). ) Is dispersed to prepare a quick-drying developer, and the same aerosol can as in Example 1 is charged with 200 ml (162.0 g) of the quick-drying developer and 250 ml (137.0 g) of LPG gas, and the same break as in Example 1 is performed. A push button incorporating an up-type spray nozzle was attached to the aerosol can.

Example 3 Carplex # 1120 (trade name: Shionogi Pharmaceutical Co., Ltd.) having the same 6.0% by weight of magnesium carbonate powder and the particle diameter of about 1 μm as in Example 1 was mixed with a mixture of 23.0% by weight of isopropyl alcohol and 68.0% by weight of acetone. Made by company)
3.0% by weight to prepare a quick-drying developer, and in the same aerosol can as in Example 1, 182 ml of the quick-drying developer (15
3.0 g) and 271 ml (149.0 g) of LPG gas, and a push button incorporating the same break-up type injection nozzle as in Example 1 was attached to the aerosol can.

(Example of penetrant flaw detection test) Each of the aerosol type quick-drying developers obtained in Examples 1 to 3 was applied, and the following penetrant flaw detection test method was performed. (1) Dye Penetration Testing Method (1-A) A type JIS-Z-2343-1992 standard test piece was used as a test specimen, and a commercially available dye penetrant (Super Check UP-NU: product) was used on the test surface. Name: Mark Tech Co., Ltd., and after standing for 8 minutes, wipe the test surface with a paper towel to wipe off excess surplus liquid, and furthermore, a commercially available cleaning solution (Super Check UR-NU: trade name: Mark Tech) (Manufactured by Co., Ltd.) with a paper towel soaked in the test surface to remove excess permeate and then at room temperature (about 18 ° C)
Below, using the aerosol type quick-drying developer obtained in Example 1,
Spray the injection hole 1 about 7 cm away from the test surface,
After standing for 5 minutes, the test surface was visually observed. As a result, a thin layer having a uniform thickness was formed on the test surface without any unevenness. Was appearing. In addition, except that the temperature of the application atmosphere of the aerosol-type quick-drying developer was set to about 5 ° C., even when the dye penetration testing method was performed under the same conditions as above, the test surface had a uniform thickness. A thin red defect indication bleeding pattern appeared on a white background on the surface of the thin layer. In each case, no clogging of the injection hole 1 occurred.

(1-B) A dye penetration test was conducted under the same conditions as in 1-A, except that the aerosol type quick-drying developer was changed to that obtained in Example 2.
A result similar to the result of A was obtained.

(1-C) A dye penetration test was conducted under the same conditions as in 1-A, except that the aerosol type quick-drying developer was changed to that obtained in Example 3.
A result similar to the result of A was obtained.

(2) Example of Fluorescent Penetrant Testing Test (2-A) The same test piece as the above A was used as a test product, and a commercially available fluorescent penetrant (Super Glow OD-1700) was placed on the test surface.
A: Trade name: Mark Tech Co., Ltd.), and after leaving it for 5 minutes, test surface with a paper towel impregnated with a commercially available remover (Super Glow R-II: Trade Name: Mark Tech Co., Ltd.) The excess permeated liquid is wiped off, and then the temperature of the applied atmosphere is set to about 5 ° C., and the spray hole 1 is separated from the test surface by about 20 cm using the aerosol type quick-drying developer obtained in Example 3. After 5 minutes, the test surface was visually observed, and a thin layer of uniform thickness was formed on the test surface. Then, the test surface was exposed to ultraviolet light in a dark place. Upon visual observation, a clear defect-indicating fluorescent bleeding pattern emitting yellow-green light appeared on the surface of the thin layer. In addition, except that the temperature of the application atmosphere of the aerosol quick-drying developer was set to room temperature (about 18 ° C.) and the distance from the injection hole 1 to the test surface was set to about 7 cm, the fluorescence penetration testing method was the same as above. When the test was performed, a thin layer having a uniform thickness without unevenness was formed on the test surface, and a clear defect indication pattern emitting yellow-green light appeared on the surface of the thin layer. . In each case, no clogging of the injection hole 1 occurred.

(2-B) Except that the aerosol-type fast-drying developer was changed to that obtained in Example 1, the fluorescence penetration testing method was carried out under the same conditions as in 2-A.
A result similar to the result of A was obtained.

(2-C) A dye penetration test was performed under the same conditions as in 2-A except that the aerosol-type fast-drying developer was changed to that obtained in Example 2.
A result similar to the result of A was obtained.

[0025]

According to the penetration testing method using the aerosol type quick-drying developer according to the present invention, as shown in the penetration testing example, the temperature of the use atmosphere is low (for example, about 10 ° C.). ), And even if the distance from the injection hole 1 to the surface of the test specimen is short (for example, about 10 cm), a thin layer of white inorganic fine powder having a uniform thickness without unevenness can be formed. Accurate flaw detection results can be obtained. Therefore, it can be said that the present invention contributes to the development of the penetrant testing method.

[Brief description of the drawings]

FIG. 1 is an enlarged explanatory view showing a disk-shaped chip used for an injection nozzle in an aerosol-type fast-drying developer according to the present invention, wherein (a) is a perspective view, (b) is a bottom view, and (c). FIG. 4 is a sectional view taken along line AA of FIG.

FIG. 2 is an explanatory longitudinal sectional view showing a push button of an aerosol can incorporating a disk-shaped chip used for an injection nozzle in an aerosol-type fast-drying developer according to the present invention. In addition,
What is shown by a dotted line in the figure is the nozzle portion of the aerosol can.

FIG. 3 is an explanatory longitudinal sectional view showing a push button of an aerosol can in which a disk-shaped chip used for an injection nozzle in a conventional aerosol type quick-drying developer is incorporated. In addition,
What is shown by a dotted line in the figure is the nozzle portion of the aerosol can.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Disc-shaped chip main body 11 Perimeter 2 Injection hole 3 Circular cavity 31 Peripheral wall 4 Straight groove 41 Outer end 5 Injection passage 6 Push button of aerosol can 61 Disc-shaped cavity 62 Bottom of disc-shaped depression 63 Injected material Passage pipe

Claims (1)

(57) [Claims] 1. A fast-drying developer in which 5 to 15 parts by weight of a white inorganic fine powder is dispersed in 100 parts by weight of a volatile low-boiling organic solvent.
In an aerosol-type quick-drying developer used in a penetrant test method in which 35 to 60% by weight and 40 to 65% by weight of a liquefied gas for injection are filled in an aerosol can with an injection nozzle, the particle size of the white inorganic fine powder is , 0.1 to 2 μm,
In addition, the injection nozzle forms an injection hole 2 penetrating from the front surface to the back surface in the center of the disk-shaped chip body 1 having a certain thickness, and a circular shape centered on the injection hole 2 on the back surface of the body 1. One or a plurality of straight grooves 4 are formed in the circumferential tangent direction of the hollow 3 to form the hollow 3 and connect the peripheral edge 11 of the main body 1 and the peripheral wall 31 of the hollow 3. An aerosol-type fast-drying developer used in a penetrant flaw detection test method, which is a break-up type spray nozzle in which a jet path 5 is connected to an outer end 41 of a groove 4.